mirror of https://github.com/mgcaret/rom4x.git
Initial code commit
This commit is contained in:
mgcaret
parent
b224304dfd
commit
1cf35fd0f8
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@ -0,0 +1,6 @@
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*.o65
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*.lbl
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*.bin
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*.swp
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copyrom.sh
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#include "iic.defs"
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.text
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* = gorst4x
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sta rombank ; gorst4x
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jmp rst4xrtn ; in other bank jmp reset4x
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sta rombank ; gobt4x
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jmp bt4xrtn ; in other bank jmp boot4x
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sta rombank ; gobanner
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jsr banner ; in other bank jmp $c784 for now
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sta rombank ; return to other bank
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rts ; should never get here
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@ -0,0 +1,7 @@
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; patch PWRUP to call boot4x
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#include "iic.defs"
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.text
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* = $fab4
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nop
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jmp gobt4x
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@ -0,0 +1,7 @@
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; patch RESET.X to call reset4x
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#include "iic.defs"
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.text
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* = $fac8
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jmp gorst4x
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#include "iic.defs"
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.text
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* = gorst4x
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sta rombank ; gorst4x
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jmp reset4x ; in other bank jmp rstxrtn
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sta rombank ; gobt4x
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jmp boot4x
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sta rombank ; gobanner
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jmp $c784 ; in other bank jsr appleii
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sta rombank
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rts ; not in other bank
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@ -0,0 +1,228 @@
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#include "iic.defs"
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.text
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* = reset4x
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stz power2 + rx_mslot ; action = normal boot
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asl butn1 ; closed apple
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bcs ckdiag
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exitrst jmp gorst4x ; return to RESET.X
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; check to see if both apples are down
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ckdiag bit butn0 ; open apple
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bmi exitrst ; return to RESET.X
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; present menu because only closed apple is down
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menu4x jsr gobanner ; "Apple //c"
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ldx #$00 ; menu start
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jsr disp ; show it
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jsr gtkey
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cmp #$b0 ; "0"
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bne ckkey1
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ldx #$ff ; reset stack
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txs
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lda #>(monitor-1) ; monitor entry ons tack
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pha
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lda #<(monitor-1)
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pha
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jmp swrts2 ; rts to enter monitor
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ckkey1 cmp #$b2 ; "2"
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beq doconf
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cmp #$b4 ; "4"
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bne ckkey2
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doconf jsr confirm
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bne menu4x ; go back to menu4x
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ckkey2 sec
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sbc #$b0 ; ascii->number
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bmi menu4x ; < 0 not valid
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cmp #$08
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bpl menu4x ; > 7 not valid
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sta power2 + rx_mslot ; for boot4x
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stz softev + 1 ; deinit coldstart
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stz pwerdup ; ditto
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bra exitrst
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gtkey lda #$60
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sta ($0),y ; cursor
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sta kbdstrb ; clr keyboard
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kbdin lda kbd ; get key
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bpl kbdin
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sta kbdstrb ; clear keyboard
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sta ($0),y ; put it on screen
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rts
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; display message, input x = message start relative to msg1
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disp stz $0 ; load some safe defaults
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lda #$40
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sta $1
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ldy #$0 ; needs to be zero
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disp0 lda msg1,x ; get message byte
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bne disp1 ; proceed if nonzero
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rts ; exit if 0
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disp1 inx ; next byte either way
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cmp #$20 ; ' '
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bcc disp2 ; start of ptr if < 20
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eor #$80 ; invert high bit
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sta ($0),y ; write to mem
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inc $0 ; inc address low byte
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bra disp0 ; back to the beginning
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disp2 sta $1 ; write address high
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lda msg1,x ; get it
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sta $0 ; write address low
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inx ; set next msg byte
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bra disp0 ; back to the beginning
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confirm pha
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ldx #(msg3-msg1) ; ask confirm
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jsr disp
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jsr gtkey
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plx
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ora #$20 ; to lower
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cmp #$f9 ; "y"
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php
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txa
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plp
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rts
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; msg format
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; high bit set indicates high byte of address
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; this bit is inverted before use. Next byte must be
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; low byte of address. Anything else are characters to
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; display and will have their upper bit set before
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; being written to the screen.
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msg1 = *
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.db $05,$06,"0 Monitor"
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.db $05,$86,"1 Reboot"
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.db $06,$06,"2 Zero RAM Card and Reboot"
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.db $06,$86,"3 Diagnostics"
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.db $07,$06,"4 RAM Card Diagnostics"
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.db $07,$86,"5 Boot SmartPort"
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.db $04,$2e,"6 Boot Int. 5.25"
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.db $04,$ae,"7 Boot Ext. 5.25"
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.db $07,$5f,"By M.G."
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msg2 .db $07,$db,"ROM 4X 01/01/17"
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.db $05,$ae,$00 ; cursor pos in menu
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msg3 .db $05,$b0,"SURE? ",$00
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.dsb boot4x - *, 0
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* = boot4x
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jsr gobanner ; "Apple //c"
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lda power2 + rx_mslot ; get action saved by reset4x
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beq boot4 ; if zero, continue boot
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ldx #(msg2-msg1) ; short banner offset
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jsr disp ; display it
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jsr rdrecov ; try to recover ramdisk
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lda power2 + rx_mslot ; boot selection
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btc2 cmp #$02 ; clear ramcard
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bne btc3
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jsr rdclear ; do clear
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bra boot4
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btc3 cmp #$03 ; Diags
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bne btc4
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jmp $c7c4
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btc4 cmp #$04 ; RX diags
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bne btc5
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ldx #$ff
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txs ; reset stack
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ldy #rx_mslot ; diag routine needs
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ldx #rx_devno ; ditto
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stx sl_devno ; diags need this
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jsr testsize ; compute card size
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lda #>(monitor-1) ; load "return" address
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pha ; into stack so that we
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lda #<(monitor-1) ; exit card test into
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pha ; the monitor
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lda numbanks,y ; get the card size in banks
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bne dordiag ; do diag if memory present
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jmp swrts2 ; otherwise jump to monitor
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dordiag jmp $db3a ; diags
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;bra boot4
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btc5 cmp #$05 ; boot smartport
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beq boot5
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btc6 cmp #$06 ; boot int drive
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beq boot6
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btc7 cmp #$07 ; boot ext drive
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bne boot4 ; none of the above
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; copy small routine to $300 to boot
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; external 5.25
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ldy #(bt4xend-bootext+1)
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btc7lp lda bootext,y
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sta $300,y
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dey
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bpl btc7lp
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lda #$03 ; copy done
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ldx #$00
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bra bootadr
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boot4 lda #rx_mslot ; boot slot 4
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bra bootsl
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boot5 lda #$c5 ; boot slot 5
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bra bootsl
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boot6 lda #$c6 ; boot slot 6
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bootsl ldx #$00 ; low byte of slot
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bootadr stx $0 ; store address
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sta $1 ; return to bank 0 does jmp (0)
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endbt4x jmp gobt4x ; continue boot
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rdrecov ldy #rx_mslot ; attempt to recover ramdisk
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ldx #rx_devno
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lda pwrup,y ; get power up flag
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cmp #pwrbyte ; already initialized?
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bne checkrd ; continue if not initialized
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rts ; exit if initialized
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checkrd jsr testsize ; does not wreck x or y
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lda numbanks,y ; get discovered # banks
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bne ckrd1 ; continue if size > 0
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rts ; exit if no mem
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ckrd1 stz addrl,x ; set slinky address 0
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stz addrm,x
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stz addrh,x
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lda data,x ; start compare to ProDOS boot block
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cmp #$01
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beq ckrd2
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rts ; not ProDOS
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ckrd2 lda data,x
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cmp #$38
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beq ckrd3
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rts ; not ProDOS
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ckrd3 lda data,x
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cmp #$b0
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beq dorecov
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rts ; not ProDOS
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dorecov lda #pwrbyte
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sta pwrup,y ; set power byte
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lda "R" ; tell user
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sta $7d0 ; on screen
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rts
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; zero ram card space
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rdclear ldy #rx_mslot
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ldx #rx_devno
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jsr testsize ; get size
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lda #$c0 ; 'A' - 1
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sta $400 ; upper left corner
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lda #$00 ; we are going to write this everywhere
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sta addrl,x ; slinky address 0
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sta addrm,x
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sta addrh,x
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ldx numbanks,y ; # of 64Ks to write
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beq clrdone ; no memory
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clbnklp phx ; wish the 65xx had more registers
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inc $400 ; poor mans progress meter
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ldy #$00
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cl64klp ldx #$00 ; loop for all pages in bank
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cl256lp phx ; loop for all bytes in page
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ldx #rx_devno ; more registers, please!
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sta data,x ; write a zero to card
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plx
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dex
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bne cl256lp
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dey
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bne cl64klp
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plx
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dex
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beq clrdone
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bra clbnklp
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clrdone ldy #rx_mslot
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sta pwrup,y ; zero screen holes
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sta numbanks,y
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lda #$a0 ; ' '
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sta $400 ; clear progress
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rts
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; next is snippet of code to boot external 5.25
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bootext sei
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lda #$e0
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ldy #$01
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ldx #$60
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jmp $c60b
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bt4xend = *
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@ -0,0 +1,49 @@
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source_rom = "iic_rom4.bin"
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dest_rom = "iic_rom4x.bin"
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rom_base = 0xc000
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source_files = Rake::FileList.new('*.s')
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desc "Default: clean and build it"
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task :default => [:clean, :assemble, :build_rom] do
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sh "ls -l #{dest_rom}"
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end
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desc "Clean object files"
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task :clean do
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sh "rm -f #{dest_rom}"
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sh "rm -f *.o65"
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sh "rm -f *.o65.lbl"
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end
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desc "Assemble all source files"
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task :assemble => source_files.ext('.o65')
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rule ".o65" => ".s" do |t|
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sh "xa -c -o #{t.name} -l #{t.name}.lbl #{t.source}"
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end
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desc "Build ROM"
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task :build_rom => [:assemble] do
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puts "Building ROM image..."
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obj_files = Rake::FileList.new('*.o65')
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rom = File.read(source_rom)
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obj_files.each do |t|
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if t =~ /B(\h)_(\h{4})/
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bnum = $1.to_i(16)
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badd = $2.to_i(16)
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addr = bnum * 16384 + badd - rom_base
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puts "Loading #{t} into bank #{bnum} @ #{badd.to_s(16)}, file addr #{addr.to_s(16)}"
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fc = File.read(t)
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fc.each_byte do |b|
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rom.setbyte(addr, b)
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addr += 1
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end
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else
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puts "I dont know where to load #{t}"
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end
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end
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File.write(dest_rom, rom)
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puts "ROM image done: #{dest_rom}"
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end
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@ -0,0 +1,53 @@
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; hardware
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rombank = $c028
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butn0 = $c061
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butn1 = $c062
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kbd = $c000
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kbdstrb = $c010
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addrl = $bff8
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addrm = $bff9
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addrh = $bffa
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data = $bffb
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; screen holes
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; same as //c firmware listing, need to add $c4 for mem card in slot 4
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sl_scrn1 = $478 - $c0
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sl_scrn2 = $4f8 - $c0
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sl_scrn3 = $578 - $c0
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sl_scrn4 = $5f8 - $c0
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sl_scrn5 = $678 - $c0
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sl_scrn6 = $6f8 - $c0
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sl_scrn7 = $778 - $c0
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sl_scrn8 = $7f8 - $c0
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numbanks = sl_scrn1
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pwrup = sl_scrn7
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; next loc is commented in firmware listing, but apple engineers
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; planned on a more sophisticated power-up check that they didn't do
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; we will repurpose this to store selected closed-apple menu item
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power2 = sl_scrn8
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sl_devno = $778
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; locations
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softev = $3f2
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pwerdup = $3f4
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; values
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pwrbyte = $a5
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rx_slot = $4
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rx_mslot = rx_slot + $c0
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rx_devno = rx_slot * $10 + $88
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; entry points
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gorst4x = $c763 ; switch to/from reset4x
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gobt4x = gorst4x + 6 ; switch to/from boot4x
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gobanner = gobt4x + 6 ; banner from bank 1
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rst4xrtn = $facb ; where to return from reset4x
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;bt4xrtn = $fb12 ; where to return from boot4x
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bt4xrtn = $fb19 ; where to return from boot4x
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reset4x = $e000 ; reset routine
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boot4x = $e180 ; boot routine
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banner = $fb60 ; 'Apple //c'
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testsize = $d99f ; test ramdisk size (rom 3 = $d995)
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monitor = $ff59 ; monitor
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swrts2 = $c784 ; switch firmware and rts
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